Rewind core and endpiece



May 1943. R. CREBBS REWIND CORE AND END PIECE Fiied Sept. 16, 1941 m 08 E M E mm E A I L M. v. B J 4 T m u M m O I Patented May 25, 1943 UNITED STATES PATENT OFFICE 2 Claims.

My invention relates to rewind cores and more particularly to a hollow cardboard rewind core having a cardboard end piece fitted thereto, the complete core being suitable for use in winding dispensable paper articles thereon, and in un- I rolling these articles from a dispenser.

My invention is peculiarly adapted for use as a core for holding rolled tissue articles, such as toilet paper, toilet seat covers, paper towels and the like.

A large number of dispensable papcr articles are wound on inexpensive hollow cardboard cores from a large roll of paper stock, in a paper converting machine. The paper as it passes through the converting machine is perforated, cut or otherwise modified so that the strip on the rewind roll is of a definite length and in condition to be dispensed as individual articles by tearing along weakened portions of the strip. In order that dispensing may be properly accomplished, it is customary to place the rewind roll, with its full load of converted paper wound thereon, in some type of dispenser which has axial pins engaging apertures in the ends of the rewind roll.

Obviously, however, expense is a large factor in producing the rewound roll, and while cardboard tubing is a standard article, made in large quantities and easily obtained, the design of proper end pieces for this hollow tubing has always provided a problem for the paper converter.

End; pieces are usually relatively expensive, may require in many cases a complicated assembly operation, and they must be so attached to the core as to withstand the high speed rewinding operation, and thereafter 'be left in condition so that they will be available to properly support the rewound core in the dispenser.

The main object of the present invention is to provide an end piece for a hollow cardboard core which is simple, which is easy and cheapto manufacture, which can be quickly 'and-efficiently assembled to the core, and which after assembly will properly withstand rewinding stresses and still be in condition to properly support the core with its paper wound thereon in a dispenser.

Other objects of my invention will be apparent or will be specifically pointed out in the description forming a part of this specification, but I do not limit myself to the embodiment of the invention herein described, as various forms may be adopted within the scope of the claims.

In the drawing:

Fig. 1 is a perspective view showing the end piece forming a part of my invention in its final position.

Fig. 2 is a perspective view showing the end piece and core before assembly.

'Fig. 3 is a plan view of an end piece blank.

Fig. 4 is an end view of the end-piece and core after insertion of the end piece into the end of the core; showing the distortion of the cylindrical core by insertion of the end piece.

Fig. 5 is a view partly in section and partly in elevation showing how a completed core is mounted for rewindingpurposes.

Referring directly to the drawing for a more detailed description of myinvention, a cardboard cylinder I is provided of the proper size and length for paper articles to be rewound thereon'in a machine for: example, such as has been shown, describedand claimed in the-Feurt Patent No. 2,256,082. These cores are usually cut to the proper length but without end pieces.

As. an end piece Iprefer first to make acardboard blank 2 having a central generally disc shaped portion 3, and laterally extending portions 4 4, these portions extending in opposite directions from opposite sides of the disc 3. The blank 2 is provided with score lines 5-5 at the junction of the lateral extensions 4 with the central disc 3 to facilitate folding of the blank, these score lines being parallel, and following parallel chords of the extended disc circumference.

It willbe noted that the width of extensions !4 is not the full width of the chords but is shorter. than these chords, so that notches 6' are left/atv the junction of the lateral extensionsfl with .the central disc 3';

Preferably, the diameter of the disc along the line parallel to scoring 5 is substantially the same as that of the outside diameter of core I. Notches-B are made to be somewhat less than the thickness of core I, so that after assembly.

as will be seen later, the lateral extensions 4 are of sufiicient width to distort the circularity of the end of core I in which the end piece is inserted. After-the blank 2 has been formed and scored, it is bent along the score lines 5' with lateral extensions 4- parallel as shown in Fig. 2.

The ends of the lateral extensions 4 are then placed inside of one end'of core I, this being easy to accomplish as the lateral extensions are movable toward each other to facilitate entrance. The partially inserted end piece is then forced into the core until the disc portion 3 registers with the end surface I of the core. Inasmuch as lateral extensions 4 are left to have a greater width than the inside chord of the circular end of core I at the point of registry, the end of the core is distorted as shown in Fig. 4. The distortion in this figure is somewhat exaggerated for clarity of illustration. The end of the core therefore tightly grips the extensions 4 adjacent their attachment to disc portion 3, and holds the end piece firmly in position due to the fact that the end of the core I tends to regain circularity of shape as the remainder of the core is circular and remains circular after the end piece is installed.

In addition to the fact that the end piece is firmly gripped by the distortion of the end of the core, the outer edges 8 of the lateral extensions 4 cut grooves 9 into the interior surface of the core as the end piece is being forced into the core. These grooves serve to couple the end piece and the core during the rewinding operation, as it is preferred that the rewinding power be applied to the end piece only. In order to facilitate the cutting of grooves 9, the end piece 2 may be made of slightly harder cardboard than that used in core I.

The rewind power may be applied as shown in Fig. 5. Here a chuck Ill rotating in a bearing I I is provided with an end piece face I2 having a central pilot pin I3 entering a central aperture I4 in the disc portion 3 of the end piece. Pilot pin I3 centers the assembled core and end piece on the chuck. The opposite end of the core may be provided with another end piece centered by an opposing chuck (not shown) having a pilot pin similar to pilot pin I3 and mounted coaxial therewith.

Power is applied from rotating chuck II] to end piece 2 by sharpened pins I5 projecting slightly from face I2, so that when the core is placed over pin I3 and moved toward the chuck face, the ends of pins I4 will engage the end piece and transmit the rotating power to the end piece. The end piece in turn transmits the rotating power to the core I by the engagement of edges 8 with channel 9 in the end of the core.

Core I is thus made to rotate and the converted paper may be wound thereon by driving chuck IIl so that after a certain length of paper strip I5 has been wound on core I, core I may be removed with its paper thereon, and used in a dispenser.

It has been found that the rewinding force applied to the end piece 2 does not loosen the end piece. In fact the grip of the core on the end piece is still further enhanced by the fact that it is customary to wind the paper strip I5 onto the core under tension with the edges of the paper strip fairly close to the ends of core I. The tension of the strip wound on core I therefore tends to circularize the distorted ends of the core adjacent the end piece and cause this distorted end to grip the end piece even harder after rewinding than before.

Thus after the strip I5 has been wound upon the core, the core is in condition to be removed from the converting machine, and mounted in a dispenser where it can rotate freely on central pins entering apertures I4 in opposite end pieces until the entire amount of paper articles wound on the core is dispensed. The core is then thrown away.

It can thus be seen that I have provided a rewinding core having an end piece made of a single piece of cardboard, this end piece requiring only blanking and bending to be placed in condition to be forced into the open ends of the cylindrical core. This insertion can be done by a very simple operation, either manual or automatic, with the dimension of the inner core engaging portions of the end piece being such as to cause thecore to become slightly distorted and grooved to the end that the fixation of the end piece in the core is sufiicient to withstand rewinding stresses and thereafter still be solidly retained in the core for use in dispensing.

The end pieces are cheapto manufacture, cheap to form and cheap to insert, and greatly reduce the cost of rewind cores, both as to material and. time of assembly.

I claim:

1. In combination with a hollow cardboard cylindrical core, a cardboard end piece therefor consisting of a disc portion having a diameter substantially equal to the outside diameter of said core and a central aperture, said disc having lateral extensions extending from opposite parallel chords of said disc and having a width adjacent said disc chords less than said disc chord and slightly greater than the corresponding chord of the inside of said core, said extensions being bent along said disc chards at right angles to said disc portion in the same direction, said end piece being forced into an end of said core until said disc portion is adjacent the end section of said core with said lateral extensions at least adjacent the disc portion remaining in planar condition along said core interior chords thereby distorting said core anddue to the excess Widths of said extensions or er the core interior chords occupied thereby, said distortion holding said end piece in place against core rotating forces applied to said end piece.

2. In combination with a hollow cardboard cylindrical core, a cardboard end piece therefor consisting of a disc portion having a diameter substantially equal to the outside diameter of said core and a central aperture, said disc having lateral extensions extending from opposite parallel chords of said disc and having a width adjacent said disc chords less than said disc chord and slightly greater than the corresponding chord of the inside of said core, said extensions being bent along said disc chords at right angles to said disc portion in the same direction, said end piece being forced into an end of said core until said disc portion is adjacent the end section of said core with said lateral extensions at least adjacent the disc portion remaining in planar condition along said core interior chords thereby distorting said core end into a shape approaching a square section due to the excess widths of said extensions over the core interior chords occupied thereby, said distortion holding said end piece in place against core rotating forces applied to said end piece.

EARL R. CREBBS. 

